The goal of this study was to compare the vegetation structure of macrophytes in an anabranch-lake system. Sampling was carried out at flood in three types of aquatic vegetation, (wild-rice, floating meadow and Polygonum bank) in anabranch Bonfim (lotic) and in lake Mandioré (lentic) in plots along transects, to estimate the percent coverage and record life forms of species. We collected 59 species in 50 genera and 28 families. Fabaceae and Poaceae were the most representative and emergent plants predominated (62%). In the anabranch, with 48 species, Polygonum acuminatum and Paspalum repens (7%) were more frequent (8%); in the lake, with 39 species, the most frequent were Polygonum ferrugineum (7%) and Hymenachne amplexicaulis (9%). Both evaluated ecosystems have low floristic similarity (66.6%), which was repeated among the communities analyzed by environment: wild-rice (0.33%), Polygonum banks (0.37%); floating meadows (0.32%). The anabranch was richer and more diverse than the lake; wild-rice community was the most diverse compared to other ones in anabranch, while in the lake the Polygonum bank community was the most diverse. The life forms of species varied in relation to the environments (lotic and lentic) studied.
Enviado em junho de 2012; aceito em novembro de 2012. ResumoO Cerrado é a savana com maior riqueza florística do planeta e também uma das regiões mais fragmentadas e ameaçadas do mundo. Diante disso, inventariar e conhecer a diversidade de espécies vegetais no Cerrado uma iniciativa muito importante. O presente trabalho foi realizado na Floresta Nacional de Silvânia, com o objetivo de analisar a estrutura fitossociológica das vegetações de cerrado sentido restrito (cerrado s.r.) e campo sujo da unidade de conservação. A amostragem foi realizada através de parcelas de 10 x 10 m, sendo 15 no cerrado s.r. e 10 no campo sujo. Entraram na amostragem os indivíduos lenhosos com diâmetro, igual ou superior a 5 cm a 30 cm do solo. Foram registradas 60 espécies em 46 gêneros distribuídas em 28 famílias, sendo 52 espécies no cerrado s.r. e 27 no campo sujo. As famílias que apresentaram mais espécies foram Malpighiaceae (7), Fabaceae (6) e Vochysiaceae (5 Este artigo é de Acesso Livre, disponibilizado sob os termos da Creative Commons Attribution 3.0 Unported License (http://creativecommons.org/licenses/by/3.0/) que permite uso não-comercial, distribuição e reprodução em qualquer meio, desde que este trabalho original seja devidamente citado.
We present a floristic survey of the genus Tetrapterys (Malpighiaceae) from the Brazilian Midwest, including morphological descriptions, keys, comments on taxonomy and phenology, illustrations, and distribution maps for all species. Nine species were found in the studied area: T. ambigua, T. crispa, T. discolor, T. hassleriana, T. jussieuana, T. microphylla, T. mucronata, T. racemulosa, and T. ramiflora. The distribution of species shows a collection gap mostly in northern States of Mato Grosso and southeastern Mato Grosso do Sul. Only T. ambigua and T. ramiflora were found in all federal units within the Brazilian Midwest, and three species were recorded for just one, T. hassleriana and T. racemulosa in Mato Grosso do Sul, and T. microphylla in Goiás, restricted to the Chapada dos Veadeiros.
Malpighiaceae is one of the major families of tropical and subtropical lianas, easily recognized in the field due to its remarkable flower conservatism. The family has been the subject of different phylogenetic studies over the past fifteen years, which have demonstrated the paraphyly of its subfamilies, most of its tribes, and some of its largest genera. Some of the most drastic changes have occurred in Mascagnia and Tetrapterys, where ten genera were segregated (eight of them new) making it difficult for general botanists to reassign many commonly known species. As a first attempt to clarify most of the recent generic changes within the family, we present a taxonomic synopsis of Malpighiaceae from the Atlantic Forest in Brazil and Argentina, including an illustrated key, morphological generic descriptions, an updated checklist of species for each genera, and figures of all genera found in this biome.
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